How does the entropy change in the reaction 2C2H2 (g) + 5O2 (g) 4CO2 (g) + 2H2O (l) ?

A. The entropy increases.

B. The entropy stays constant.

C. The entropy decreases.

D. It is impossible to tell.

How much water needs to be added to an 18.0 M stock solution of sodium hydroxide in order to make 450.0 mL of 0.250 M sodium hydroxide solution?

Which of these statements best explains why chemistry is reliable? It is biased. It cannot be verified. It cannot add new evidence to existing evidence. It gives the same result when an experiment is repeated.

What is not a trace gas found in our atmosphere oxygen, argon, carbon dioxide or neon

It requires 2,500 joules to raise a certain amount of water (c = 4.186J/g°C) from 20.0°C to 65.0°C. What is the mass of the water that is being heated? a 80 g b 138 c 40 g d 158 g

the abrupt change in salinity with depth is known as a? A halocline b thermocline C salolocline D pycnocline

When lithium reacts with bromine to form the compound LiBr, each lithium atom: (1) gains one electron and becomes a negativelycharged ion (2) gains three electrons and becomes a negativelycharged ion (3) loses one electron and becomes a

Based on what you know about matter, explain why the food coloring mixes at different rates

What does the variable A stand for in the Arrhenius equation? A. activation energy B. frequency factor C. rate constant D. reactant concentration

Name 3 sets of elements that have been added to the periodic table since mendeleev's time

What is the rate law for step 2 of this reaction? Express your answer in standard MasteringChemistry notation. For example, if the rate law is k[A][C]3 type k*[A]*[C]^3.